The original Final Solution plan was sending the Jews to Palestine through the Haavara agreement. During the war, they initially had the idea for the Madagascar Plan, but then when that was deemed unrealistic, they tried to send Croatian and Slovakian Jews back home, but their host countries wouldn’t take them. Britain was even scared to take in Bulgarian Jews as late as 1943 according to the British foreign secretary:
"... that the whole problem of the Jews in Europe is very difficult and that we should move cautiously about offering to take all Jews out of a country like Bulgaria. If we do that, then the Jews of the world will be wanting us to make similar offers in Poland and Germany. Hitler might well take us up on any such offer and there simply are not enough ships and means of transportation in the world to handle them.”
Their reasoning was that if they allowed certain groups of Jews in, all the other Jews would probably ask for the same treatment and Hitler and the National Socialist regime would actually allow them to. This goes completely against the idea that the Germans were systematically trying to kill them all this late during the war.